Novak Ballistic sleeve Gap

[chemax92]

Hello.

I have bought a brand new 8.5t Ballistic motor.
It works Ok but the sleeve fits loose against the endbells, about 0.75mm gap along axis.
Tried several sleeves and also exchanging the winding module for another bought directly from Novak but the result is the same.
It is an aesthetical problem but dirt can get inside motor thru this gap.
See pic attached.
My motor is one of the earliest batch. Some friends of mine recently bought he same motor but the fit is ok. Maybe any teething problems?

Anyone had any similar experience?

Thanks and regards.
JMF